“In a free society, some are guilty, but all are responsible.” A mystic, a 20th-century religious intellectual, a social change agent, Rabbi Abraham Joshua Heschel marched alongside Martin Luther King, Jr., famously saying afterwards that he felt his legs were praying. Heschel’s poetic theological writings are still read and widely studied today. His faith was as much about “radical amazement” as it was about certainty. And he embodied the passionate social engagement of the prophets, drawing on wisdom at once provocative and nourishing.